To provide an anaerobic digestion treatment apparatus that improves the contact efficiency between the solid content of undecomposition and a cell, and promotes the digestion under an anaerobic condition, and to provide a digestion accelerated procedure.
The anaerobic digestion treatment apparatus includes: a methane fermentation tank 31 that performs an anaerobic digestion treatment of an organic raw material; a solid-liquid separator 32 that solid-liquid separates a digestive sludge; a supply route 33 that supplies the digestive sludge of the methane fermentation tank 31 to the solid-liquid separator 32; and a sending back route 34 that supplies the concentration digestion sludge of the solid-liquid separator 32 to the methane fermentation tank 31, and includes a swirl flow generator 45 that forms a swirl flow that turns around the center of the methane fermentation tank 31 by a plane view, wherein the sending back route 34 opens to the center neighborhood of the swirl flow, and sends back the concentration digestion sludge of the solid-liquid separator 31 to the region near the tank bottom of the methane fermentation tank 31.
SEKI AKIHIRO
YAMAMOTO TETSUYA
